气候变化领域集成服务门户(CCPortal): Refined model of incremental emplacement based on structural evidence from the granodioritic Newry igneous complex, Northern Ireland

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DOI	10.1130/B31756.1
	Refined model of incremental emplacement based on structural evidence from the granodioritic Newry igneous complex, Northern Ireland
	Anderson P.E.; Stevenson C.T.; Cooper M.R.; Meighan I.G.; Reavy R.J.; Hurley C.T.; Inman J.; Ellam R.M.
发表日期	2018
ISSN	167606
起始页码	740
结束页码	756
卷号	130 期号:2021-05-06
英文摘要	Although many intrusions are now known to have been incrementally emplaced, the mechanisms through which this takes place are generally poorly understood. The Newry igneous complex was incrementally emplaced within the Southern Uplands-Down- Longford terrane of Northern Ireland during late Caledonian sinistral transtension. This study uses a variety of new and existing data and techniques to provide a fuller and firmer understanding of incremental emplacement than has previously been available, addressing both deep-crustal processes and those operating within the emplacement site. Host-rock orientations suggest that some of the accommodation space for the Newry igneous complex was generated due to pullapart tectonics operating within the Southern Uplands-Down-Longford terrane. Local host-rock deflections, concentric igneous foliations, and concentric linear anisotropy of magnetic susceptibility (AMS) fabrics show that inflation due to magma overpressure also generated significant space. Strong AMS fabrics close to the boundaries of some magma pulses in turn suggest that inflation was accomplished by injection of individual magma pulses and was thus incremental. The dome-like orientations of mineral foliations within plutons and the truncation of steep local host-rock tracts by the Newry igneous complex imply that the complex consists of four laccolithic bodies. On a larger scale, it is suggested that the deep-seated Argyll and Newry lineaments represent faults that allowed magma generated at depth to ascend to the crustal level of the Southern Uplands- Down-Longford tract boundaries. It is also inferred that sinistral movement along the Argyll and Newry lineaments may have produced the releasing bend within the Southern Uplands-Down-Longford terrane. Higher in the crust, reduced confining pressure resulted in tectonic opening along this releasing bend. This local stress field induced horizontal magma flow and emplacement of the Newry igneous complex as laccolithic bodies. This study suggests that simplistic emplacement models should largely be abandoned in favor of holistic models incorporating the multiple interdependent processes operating during magma ascent and emplacement. © 2017 Geological Society of America.
语种	英语
来源期刊	Bulletin of the Geological Society of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/185034
作者单位	School of Geography, Earth, and Environmental Sciences, University of Birmingham, Edgbaston, Birmingham, B15 2TT, United Kingdom; Geological Survey of Northern Ireland, Dundonald House, Upper Newtownards Road, Belfast, BT4 3SB, United Kingdom; Scottish Universities Environmental Research Centre, Rankine Avenue, Scottish Enterprise Technology Park, East Kilbride, G75 0QF, United Kingdom; School of Natural Sciences, Department of Geology, Trinity College, Dublin 2, Ireland; School of Biological, Earth, and Environmental Sciences, University College Cork, Cork, Ireland
推荐引用方式 GB/T 7714	Anderson P.E.,Stevenson C.T.,Cooper M.R.,et al. Refined model of incremental emplacement based on structural evidence from the granodioritic Newry igneous complex, Northern Ireland[J],2018,130(2021-05-06).
APA	Anderson P.E..,Stevenson C.T..,Cooper M.R..,Meighan I.G..,Reavy R.J..,...&Ellam R.M..(2018).Refined model of incremental emplacement based on structural evidence from the granodioritic Newry igneous complex, Northern Ireland.Bulletin of the Geological Society of America,130(2021-05-06).
MLA	Anderson P.E.,et al."Refined model of incremental emplacement based on structural evidence from the granodioritic Newry igneous complex, Northern Ireland".Bulletin of the Geological Society of America 130.2021-05-06(2018).